Euura viduata (Zetterstedt, 1838) PR.

Prous, Marko, Liston, Andrew, Monckton, Spencer K., Kramp, Katja, Vårdal, Hege, Vikberg, Veli, Heibo, Erik & Mutanen, Marko, 2025, West Palaearctic species of Euura Newman, 1837 (Hymenoptera, Tenthredinidae), European Journal of Taxonomy 977, pp. 1-377 : 211

284 Euura viduata group

The group is well defined genetically and based on female lancets. The lancets have short and stout setae, are often strongly curved, and 3–11 basal annuli are without distinct serrulae and cypsellae. Most of the specimens are mostly or nearly completely black, only E. viduata females are sometimes extensively pale. Young larvae of probably all the species of the group live hidden between leaves which do not expand and separate from each other after oviposition. Older larvae feed “normally”, exposed on the leaf edges. Eight species are recognised. Euura leucolena (short valvula 3, more curved lancet) and E. erecta (long valvula 3, less curved lancet) are genetically highly variable and not clearly defined based on nuclear genes. The boundaries between them and the exact number of species (especially in the case of E. leucolena ) remains currently uncertain. Because of these uncertainties, we have not identified all the larvae sequenced during this study.